【作者】 朱彪彪； 郭勤涛； 陶言和；

【Author】 ZHU Biaobiao;GUO Qintao;TAO Yanhe;College of Mechanical and Electrical Engineering,Nanjing University of Aeronautics and Astronautics;

【机构】 南京航空航天大学机电学院；

【摘要】 随机振动给轨道车载结构带来了长期的疲劳失效。本文以具体的轨道交通载荷下的车载供风装置为研究对象,建立较为精确的动力学模型,施加频域加速度载荷激励功率谱密度(PSD)进行随机振动分析得到危险点的应力频域特征。在轨道交通冲击和振动试验标准下,取功能振动试验量级功率谱为正常谱,计算得到其疲劳寿命。使用标准内加速度比例因子求解方法,采用1小时等效1.25年的加强谱进行了研究。基于商用软件中的宽带频域方法计算出正常谱下钢架的疲劳寿命,为供风系统的检修和改进提供了参考。为后续振动台加速试验验证提供了指导。更多还原

【Abstract】 Random vibration brings long-term fatigue failure to the rail vehicle structure.This paper takes the on-board air supply device under the specific rail transit load as the research object,establishes a more accurate dynamic model, and applies the frequency domain acceleration load excitation power Spectral density(PSD) to carry out random vibration analysis to obtain the stress frequency domain characteristics of the danger point.Under the rail transit shock and vibration test standards, the power spectrum of the functional vibration test magnitude was taken as the normal spectrum, and its fatigue life was calculated. Using the standard internal acceleration scaling factor method, the enhanced spectrum of 1 hour equivalent to 1.25 years is studied. The fatigue life of steel frame under normal spectrum is calculated based on the broadband frequency domain method in commercial software, which provides a reference for the maintenance and improvement of air supply system. It provides guidance for the follow-up vibration bench test verification.更多还原